Obtest

v. t. [imp. & p. p. OBTESTED; p. pr. & vb. n. OBTESTING.] [O. Fr. obtester, Lat. obtestari, from prefix ob and testari, to witness, from testis, a witness.] [Rare.]

1. To call to witness; to invoke as a witness.
2. To beseech; to supplicate. “Obtest his clemency.” Dryden.